[SIPForum-techwg] New Seq Number in 'Early Media' scenario

[Rohan Mahy]

Vincent,

99.9% of SIP phones, phone adapters, and softphones do call waiting  
without needing any help from an application server.

thanks,
-rohan



On Sep 13, 2006, at 6:20, Vincent wrote:
>         Hi,
>            Could u help me out how a "SIP Application Server" performs  
> CallWaiting Service.
>            How does a "SIP Application Server" initiate both the  
> calling and the called users about the waiting of the call.
>            Can u show me in form of call flow.
>            Does "SIPAS" sends 180 ringing to calling user with  
> "Alert-Info" header field and an INVITE with "Alert-Info" to the  
> called user and how does it exactly happens.   
>       
>        with regards
>         Vincent P.  
>> -----Original Message-----
>> From: techwg-bounces at sipforum.org  
>> [mailto:techwg-bounces at sipforum.org]On Behalf Of Graziani, Germano  
>> (Germano)** CTR **
>> Sent: Wednesday, September 13, 2006 6:21 PM
>> To: SIP Forum Tech WG
>> Subject: [SIPForum-techwg] New Seq Number in 'Early Media' scenario
>>
>> Hi, this is Germano from Rome.
>>  
>> We’re noticed a strange behaviour by a softphone used into a early  
>> Media scenario.
>>  
>> Between IMS and called party there is a MGW.
>>  
>> In particular:
>>  
>> 	1 	INVITE sent correctly with empty SDP,
>> 	2 	100 Trying,
>> 	3 	a “407 Proxy Authentication Required” was received,
>> 	4 	a new INVITE sent by softphone with sdp info,
>> 	5 	then a lot of RTP messages received back with Payload, SSRC, Seq  
>> and Time fields populated.
>>  
>> In some scenario the Seq field start by 0 and was increased by 1  
>> during the call and called and caller were correctly connected.
>>  
>> In another scenario the Seq field start by 0 and was increased by 1  
>> during the call … but suddenly it was reset to zero e sequential  
>> re-start again as previously.
>>  
>> In this last case called was able to listen calling, instead calling  
>> was not able to listen called party.
>>  
>> Is there someone able to help me details previous scenario and  
>> understand the reason for problem ?
>>  
>> Is this a MGW or device problem ?
>>  
>> Regards. Germano.
>>  
>>  
>>
>> ---------------------------------------------------------------------- 
>> -
>>
>> Germano GRAZIANI
>>
>> gg46 at lucent.com
>>
>> Senior Software Tester Engineer
>>
>> Covansys Telecom Practices
>>
>> gg46 at lucent.com <mailto:gg46 at lucent.com>
>>
>> Via Cesare Giulio Viola 65
>>
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>>
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>>
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